1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* Kernel module help for powerpc. 3 Copyright (C) 2001, 2003 Rusty Russell IBM Corporation. 4 Copyright (C) 2008 Freescale Semiconductor, Inc. 5 6 */ 7 #include <linux/elf.h> 8 #include <linux/moduleloader.h> 9 #include <linux/err.h> 10 #include <linux/vmalloc.h> 11 #include <linux/mm.h> 12 #include <linux/bug.h> 13 #include <asm/module.h> 14 #include <linux/uaccess.h> 15 #include <asm/firmware.h> 16 #include <linux/sort.h> 17 #include <asm/setup.h> 18 #include <asm/sections.h> 19 20 static LIST_HEAD(module_bug_list); 21 22 static const Elf_Shdr *find_section(const Elf_Ehdr *hdr, 23 const Elf_Shdr *sechdrs, 24 const char *name) 25 { 26 char *secstrings; 27 unsigned int i; 28 29 secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 30 for (i = 1; i < hdr->e_shnum; i++) 31 if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0) 32 return &sechdrs[i]; 33 return NULL; 34 } 35 36 int module_finalize(const Elf_Ehdr *hdr, 37 const Elf_Shdr *sechdrs, struct module *me) 38 { 39 const Elf_Shdr *sect; 40 int rc; 41 42 rc = module_finalize_ftrace(me, sechdrs); 43 if (rc) 44 return rc; 45 46 /* Apply feature fixups */ 47 sect = find_section(hdr, sechdrs, "__ftr_fixup"); 48 if (sect != NULL) 49 do_feature_fixups(cur_cpu_spec->cpu_features, 50 (void *)sect->sh_addr, 51 (void *)sect->sh_addr + sect->sh_size); 52 53 sect = find_section(hdr, sechdrs, "__mmu_ftr_fixup"); 54 if (sect != NULL) 55 do_feature_fixups(cur_cpu_spec->mmu_features, 56 (void *)sect->sh_addr, 57 (void *)sect->sh_addr + sect->sh_size); 58 59 #ifdef CONFIG_PPC64 60 sect = find_section(hdr, sechdrs, "__fw_ftr_fixup"); 61 if (sect != NULL) 62 do_feature_fixups(powerpc_firmware_features, 63 (void *)sect->sh_addr, 64 (void *)sect->sh_addr + sect->sh_size); 65 #endif /* CONFIG_PPC64 */ 66 67 #ifdef CONFIG_PPC64_ELF_ABI_V1 68 sect = find_section(hdr, sechdrs, ".opd"); 69 if (sect != NULL) { 70 me->arch.start_opd = sect->sh_addr; 71 me->arch.end_opd = sect->sh_addr + sect->sh_size; 72 } 73 #endif /* CONFIG_PPC64_ELF_ABI_V1 */ 74 75 #ifdef CONFIG_PPC_BARRIER_NOSPEC 76 sect = find_section(hdr, sechdrs, "__spec_barrier_fixup"); 77 if (sect != NULL) 78 do_barrier_nospec_fixups_range(barrier_nospec_enabled, 79 (void *)sect->sh_addr, 80 (void *)sect->sh_addr + sect->sh_size); 81 #endif /* CONFIG_PPC_BARRIER_NOSPEC */ 82 83 sect = find_section(hdr, sechdrs, "__lwsync_fixup"); 84 if (sect != NULL) 85 do_lwsync_fixups(cur_cpu_spec->cpu_features, 86 (void *)sect->sh_addr, 87 (void *)sect->sh_addr + sect->sh_size); 88 89 return 0; 90 } 91 92 static __always_inline void * 93 __module_alloc(unsigned long size, unsigned long start, unsigned long end, bool nowarn) 94 { 95 pgprot_t prot = strict_module_rwx_enabled() ? PAGE_KERNEL : PAGE_KERNEL_EXEC; 96 gfp_t gfp = GFP_KERNEL | (nowarn ? __GFP_NOWARN : 0); 97 98 /* 99 * Don't do huge page allocations for modules yet until more testing 100 * is done. STRICT_MODULE_RWX may require extra work to support this 101 * too. 102 */ 103 return __vmalloc_node_range(size, 1, start, end, gfp, prot, 104 VM_FLUSH_RESET_PERMS, 105 NUMA_NO_NODE, __builtin_return_address(0)); 106 } 107 108 void *module_alloc(unsigned long size) 109 { 110 #ifdef MODULES_VADDR 111 unsigned long limit = (unsigned long)_etext - SZ_32M; 112 void *ptr = NULL; 113 114 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); 115 116 /* First try within 32M limit from _etext to avoid branch trampolines */ 117 if (MODULES_VADDR < PAGE_OFFSET && MODULES_END > limit) 118 ptr = __module_alloc(size, limit, MODULES_END, true); 119 120 if (!ptr) 121 ptr = __module_alloc(size, MODULES_VADDR, MODULES_END, false); 122 123 return ptr; 124 #else 125 return __module_alloc(size, VMALLOC_START, VMALLOC_END, false); 126 #endif 127 } 128